Psychophysics is the scientific study of the relationship between physical stimuli and the subjective sensations and perceptions evoked by these stimuli. The term psychophysics is used to denote both the substantive study of stimulus-response relationships and the methodologies used for this study.

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What is 'noise'?

In both my psychology, biology and neuroscience classes, professors are constantly talking about 'noise'. For instance, our perception is limited due to 'sensory noise' in our neurons. I am utterly ...
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What is the biological limit on hearing resolution?

I sometimes wonder how many different individual musical scales could be perceived by human ears. I define a musical scale as a collection of notes that relate to some fundamental frequency by ...
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Is there an absolute minimum intensity level to the stimuli we can perceive?

By stimuli that we can perceive, I mean what our five senses can perceive. Is there an absolute minimum for humans, or can we "train" ourselves to perceive stimuli at lower intensity? And if there ...
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How well do we notice asynchronicity?

I'm stopped at a stoplight and, with nothing to do, my thoughts wander to the timed don't-walk sign that governs any pedestrians who might wish to cross the street I'm driving along. I can see two ...
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Does the human ear adapt to noise levels?

I have noticed lately that if I go to sleep, when I have my radio running, it is on lowest volume, I still consider it kind of loud. In the morning, when being on the edge of waking up, I hear the ...
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What determines the perceived pitch (frequency) of tinnitus?

I noticed that every time I suffer temporary tinnitus after going to a very loud concert, the frequency I perceive is identical. I'd put it somewhere around 17 kHz, but it's difficult to pin down with ...